@inproceedings { dias13, abstract = {This paper proposes a model giving Theory of Mind (ToM) capabilities to artificial agents to allow them to carry out de- ceptive behaviours. It describes a model supporting an N-level Theory of Mind and reports a study to assess whether equip- ping agents with a two-level ToM results in them being per- ceived as more socially intelligent than agents with a single- level ToM. A deception game being developed for intercultural training of children, used for this study, is described. Finally, we report results from this study consistent with the hypothe- sis that a two-level Theory of Mind better supports agents in deceptive behaviour.}, booktitle = {CogSci 2013- The annual meeting of the Cognitive Science Society}, keywords = {Intelligent Virtual Agents;Affective Computing;Multi-Agent Societies;}, month = {August}, pages = {2189-2194}, title = {The Great Deceivers: Virtual Agents and Believable Lies}, year = {2013}, author = {João Dias and Ruth Aylett and Ana Paiva} }